export default {
	//为当前模块开启命名空间
	namespaced:true,
	//模块的state数据
	state:()=>({
		cart:JSON.parse(uni.getStorageSync('cart') || '[]')
	}),
	
	//模块的 mutations 方法
	mutations:{
		addToCart(state,goods){
			const findResult=state.cart.find(x=>x.goods_id ===goods.goods_id)
			
			if(!findResult){
				state.cart.push(goods)
			}else{
				findResult.goods_count++
			}
			this.commit('m_cart/saveToStorage')
		},
			
		saveToStorage(state){
			uni.setStorageSync("cart",JSON.stringify(state.cart))
		},
		//更新购物车中的商品的勾选状态
			
		updateGoodsState(state,goods){
		const findResult=state.cart.find(x => x.goods_id ===goods.goods_id)
		
		if(findResult){
			findResult.goods_state=goods.goods_state
			
			this.commit('m_cart/saveToStorage')
		}
		},
		//更新商品的数量
			
		updateGoodsCount(state,goods){
			const findResult=state.cart.find(x => x.goods_id ===goods.goods_id)
			
			if(findResult){
				findResult.goods_count=goods.goods_count
				
				this.commit('m_cart/saveToStorage')
			}
		},
		//根据 Id 删除对应的商品
		removeGoodsById(state,goods_id){
			state.cart =state.cart.filter(x => x.goods_id !== goods_id)
			
			this.commit('m_cart/saveToStorage')
		},
		//更新购物车中所有商品的勾选状态
	 updateAllGoodsState(state,newState){
		 state.cart.forEach(x => x.goods_state=newState)
		 this.commit('m_cart/saveToStorage')
	 }
	},
	 
	
	// 模块的 getters 属性
	getters:{
		//购物车中所有商品的总数量
		total(state){
			//  let c=0
			//  state.cart.forEach(x=>c+=x.goods_count)
			//   return c
			
			return state.cart.reduce((total,item) => total +=item.goods_count,0)
		},
		//购物车中已勾选商品的总数量 
		checkedCount(state){
			return state.cart.filter(x => x.goods_state).reduce((total,item)=>total+=item.goods_count,0)
		},
		//已勾选商品的总价格
		checkedGoodsAmount(state){
			return state.cart.filter(x => x.goods_state).reduce((total,item) => total +=item.goods_count*item.goods_price,0).toFixed(2)
		}
	}
}